Fluoromonomer polymerization
AssigneeE.I. du Pont de Nemours and Company
InventorsWilliam Brown Farnham, Andrew Edward Feiring, Patrick Edward Lindner
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Abstract
Chain transfer agents that are chlorine-free and liquid under polymerization conditions, useful for fluoromonomer polymerization, have the following structure: R1—O—R2 They are superior to common chain transfer agents such as chloroform in being safer and environmentally benign. They are also superior to gaseous chain transfer agents such as ethane because they do not enter the fluoromonomer gas recycle streams and so do not complicate the analysis and purification of those streams.
Claims10
Polymer containing endgroups characteristic of chain transfer agent having the structure
- R1—O—R2
- wherein R1 is a straight chain or branched saturated hydrocarbon group of 1 to 6 carbon atoms with the proviso that there is at least one hydrogen atom attached to the carbon next to oxygen, and R2 is a straight chain or branched fluorocarbon group or hydrofluorocarbon group of formula CaHbFc
- wherein a is 2 to 6, b is 0 to 2a−1 and c is 2 to 2a+1 with the proviso that b+c=2a+1, said polymer being a plastic or an elastomer.
Dependencies are inferred from the claim text.